Process of dyeing.



UNITED STATES "ATENT OFFICE.

EMIL HAUSSMANN,

OF BERLIN, GERMANY, ASSIGNOR TO THE ACTIEN- PROCESS QF DYEING.

SPECIFICATION forming part of Letters Patent No. 665,7 37, dated January 8, 1901.

' Annlication filed July 10, 1900. Serial No. 23,067- (No specimens.)

To all wi'tom it may concern:

Be it known that I, EMIL HAUSSMANN, of Berlin, in the Kingdom of Prussia, German Empire, have invented new and useful Improvements in Processesof Dyeing and Print ing; and Ido hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the artto which it appertains to make and use the same. v

The application in industry of sulfnreted coloring-matters directly dyeing cotton has essentially increased during late years, but the presence of sodium sulfid employed as a solvent offers certain great inconveniences, as it is most injurious to the hands of the workmen. It prevents the use of metallic vessels, it yields waste waters containing sulfur, and it afiects,moreovcr, the fiber to a considerable extent.

I have now found that the above inconveniences may easily be avoided by simply dissolving the sulfureted coloring-matters in caustic-soda lye with the addition of certain organic substances possessing weakly-reducing properties.

The following example may illustrate my invention: Oncparl, by Weight, of immedialblack is ground with one part of caustic-soda lye (40 Baum specific gravity) and one part of boiling water. One part of glucose is added thereto, and the mixture is gently heated until a clear greenislnblack liquid is formed. 'lhestaudard solution thus obtained is ready for dyeing processes. A sufficient quantity of it is added to the dye-bath, and dyeing is ell'ected, boiling, if necessary, with addition of common salt or ndrlnal sodium snlllte. The goods are rinsed and dried.

The general character of my invention is not altered by substituting in the aforesaid example for glucose other equivalent substances susceptible to act in the presence of caustic-soda lye as weakly-reduced agents for instance, lactic acid, dextrine, milk-sugar,

or the like. I

This new process maybe applied with an analogous result for other sulfureted dyestnifsfor instance, for immedial-blne, immedialbronze, Vidal-black, thiocatechin, thiogen-black, sulfanilin-black, sulfone black, sulfogen-black,katigen-black,katigen-brown, katigen-olive,verde-italiano, cross-dye black, eclipse-black, sulfur-black, and the like.

This new method offers another great technical advantage, as it allows snlfureted dyestuffs to be employed in printing processes, from which on account of sodiuni'sulfid corroding the metallic parts of the printing apparatus they have hitherto been excluded.

For printing purposes the standard solution is to be thickened by means of British gunr or other suitable additions. Y

Having now described my invention, and in what manner the same is to be performed, what-1 claim as new is-- The herein-described process of dyeing and printing with sulfnreted coloringmatters, which consists in dissolving these coloringmatters -incaustic alkalies with the addition of glucose and then dyeing the goods with the solutions thus obtained.

In witness whereof I have hereunto signed my name, this 23d day of June, 1900, in'the presence of two subscribing witnesses.

EMIL HAUSSMANN. 

